Russian assassin hired to frame Bourne and eliminate witnesses.
Their violent pursuit drives the opening attack and the Moscow climax.
Kirill is repeatedly hired to kill Bourne, wounds him in Moscow, and pursues him in a vehicle chase.
Gretkov repeatedly employs Kirill as the physical executor of the conspiracy.
Gretkov directs Kirill to kill Bourne in Goa and later assigns him to kill Bourne again in Moscow.
Their connection is indirect through the conspiracy surrounding the Neski files.
Kirill's later actions serve the same conspiracy built around the stolen files and the earlier killing connected to Neski.
Explore the full interactive character relationship map of The Bourne Supremacy